I am too young to be a father, but I know a trans couple who did. They got a sperm donor (they're female and ftm) and the ftm had a baby I think, but then the female had the next, so they had three children in the end. I know a gay couple who just adopted their children and fostered for a while before they did. (I think one of their sons had been a foster child before - I'm not sure)
I'm going to adopt a child when I come of age, for one because I don't want to pass on my genetic problems, and for another because I want to save a child from a potentially horrible childhood elsewhere, or not being adopted at all... I have a lot to offer, and live in a good country, so I want to share that with a child even if they aren't biologically mine.